Automatic defrosting device

Claim 1

CONTROL APPARATUS COMPRISING A PLURALITY OF CONTACT MEMBERS MOVABLE RELATIVE TO ONE ANOTHER TO PROVIDE FIRST AND SECOND OPERATIVE POSITIONS FOR CONTROLLING CURRENT FLOW, A FIRST ROTATABLE CAM ENGAGEABLE BY ONE OF SAID CONTACT MEMBERS TO CONTROL MOVEMENT THEREOF, A SECOND ROTATABLE CAM ENGAGEABLE BY ANOTHER OF SAID CONTACT MEMBERS TO CONTROL MOVEMENT THEREOF, DRIVE MEANS FOR ROTATING SAID FIRST CAM IN ONE DIRECTION OF ROTATION WITH RESPECT TO SAID CONTACT MEMBERS, RESILIENT MEANS BETWEEN SAID CAMS FOR UIELDABLY URGING SAID SECOND CAM TO ROTATE IN SAID ONE DIRECTION WITH SAID FIRST CAM, RESTRAINING MEANS FOR RELEASABLE HOLDING SAID SECOND CAM AGAINST ROTATION BY SAID RESILIENT MEANS, ROTATION OF SAID FIRST CAM WHEN SAID SECOND CAM IS SO RESTRAINED BEING EFFECTIVE TO MOVE SAID ONE CONTACT MEMBER TO PROVIDE SAID FIRST OPERATIVE POSITION OF SAID MEMBERS, AND ACTUATING MEANS FOR OPERATING SAID RESTRAINING MEANS TO RELEASE SAID SECOND CAM FOR ROTATION WITH RESPECT TO SAID FIRST CAM BY SAID RESILIENT MEANS, SAID SECOND CAM THEREBY BEING EFFECTIVE TO MOVE SAID OTHER CONTACT MEMBER TO PROVIDED SAID SECOND OPERATIVE POSITION.